JPH11272194A - Liquid crystal display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and accurately assemble a liquid crystal display by visually confirming a positioning boss as a positioning target when a case is fixed to a fitting member by fixing the member to the case while the tip of the positioning boss is fitted in a positioning hole. SOLUTION: Plural positioning bosses 1c are provided integrally with a bottom surface plate or side wall in a case 1 to form a column perpendicular to the bottom surface plate. A fitting member 6 made of a metallic plate has positioning holes 6c bored in its top surface plate 6a. The positioning bosses 1c are fitted in the positioning holes 6c, the fitting member 6 is put over the case 1, and is pressed in the case 1 until the top surface of an engagement part 6h is positioned beyond the reverse surface of a claw part 1d. Lastly, it is visually confirmed that the tip parts of the positioning bosses 1c are fitted in the positioning holes 6c and then fixing of the fitting member 6 to the case 1 is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a case for accommodating a liquid crystal display device.
Further, the present invention relates to a mounting structure of a mounting member to be mounted on a case.

[0002]

2. Description of the Related Art FIG. 5 is a perspective view of a conventional liquid crystal display device.
FIG. 6 is an exploded perspective view of a conventional liquid crystal display device. A box-shaped case 21 made of a synthetic resin molded product and having an open top is provided on a bottom plate 21a, four side walls 21b provided on the outer periphery of the bottom plate 21a, and a lower portion of the outer surface of the side wall 21b. It is composed of a plurality of recesses 21c.

[0003] Further, a flat liquid crystal display element 22 in which a liquid crystal material is sealed, a lamp 23 having an elongated rod shape, and
Control unit 24 on which electronic components and the like are mounted on a printed wiring board
Are stored in the case 21. Further, the control unit 24 is electrically connected to the liquid crystal display element 22, and a light guide (not shown) is disposed between the liquid crystal display element 22 and the bottom plate 21a.

The mounting member 25 made of a metal plate is
5a, an opening 25b formed in the upper surface plate 25a, a plurality of side plates 25c formed by bending an outer peripheral portion of the upper surface plate 25a, and a plurality of L-shaped members integrally extending downward from the side plate 25c. And an arm 25d. The opening 25b is larger than the effective display area of the liquid crystal display element 22. In addition, the arm portion 25d is
c, a base 25e connected to c, and connected to the base 25e,
It is formed in an L shape by a horizontal portion 25f formed long in the horizontal direction.

[0005] The mounting member 25 is covered so as to cover the upper part of the case 21, and the lamp 23 accommodated in the case 21 is provided.
The control unit 24 is covered by the top plate 25a, and the light guide (not shown) and the liquid crystal display element 22 thereabove are formed by the top plate 25a around the opening 25b and the bottom plate 21a of the case 21. Nipped, liquid crystal display element 2
The second effective display area is mounted in a state of being exposed from the opening 25b. Further, as shown in FIG. 5, the mounting member 25 is fixed to the case 21 by bending the horizontal portion 25f of the arm portion 25d inward of the concave portion 21c, thereby forming a conventional liquid crystal display device.

[0006]

In the conventional liquid crystal display device, the fixing member 25 is fixed to the case 21 by bending all the arms 25d inward of the concave portion 21c. It was troublesome and productivity was poor. In addition, in order to efficiently bend the bent portion 25f of the arm portion 25d in order to improve productivity, a dedicated jig is required, and the introduction of this dedicated jig increases the manufacturing cost. Was invited.

Further, the mounting member 25 and the case 21 vary during manufacture, and therefore, when the mounting member 25 is mounted on the case 21, the arm 25d of the mounting member 25 is used.
And the recess 21c of the case 21 must be aligned, and there is no means for checking whether the alignment of the mounting member 25 with the case 21 has been performed accurately.

[0008]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal display element; a columnar positioning boss which houses the liquid crystal display element; And a mounting member made of a metal plate and having a positioning hole penetrated in the up-down direction, wherein the mounting member is mounted in a state in which a tip end of the positioning boss is fitted in the positioning hole. It was configured to be attached to the case.

As a second solution, the liquid crystal display device of the present invention has a configuration in which the positioning boss and the positioning hole are provided at least at diagonal positions of the mounting member and the case.

As a third solution, a liquid crystal display device according to the present invention comprises: a liquid crystal display element; a box-shaped case accommodating the liquid crystal display element and having a claw projecting from an outer surface of a side wall; A metal plate, comprising a mounting member having an arm extending below a side plate provided on an outer peripheral portion, wherein the arm is pressed into the claw, and the arm and the claw are The liquid crystal display element is locked by the attachment member and the case.

According to a fourth aspect of the present invention, in the liquid crystal display device according to the present invention, the claw portion is formed so as to be gradually higher from an upper portion to a lower portion of the side wall, and the side wall provided with the claw portion is provided. Is provided with a void portion on the back side.

As a fifth solution, a liquid crystal display device according to the present invention is characterized in that at least two of the mounting members oppose each other.
A guide piece extending downward from one side plate and having a guide groove for guiding the guide piece on at least two opposing side walls of the case, and when attaching the mounting member to the case, The guide piece is configured to be guided by the guide groove.

As a sixth solution, the liquid crystal display device of the present invention is located below the side plate of the mounting member,
A stopper is provided which protrudes from the outer side surface of the side wall of the case, and a lower end of the mounting member comes into contact with the stopper when the mounting member is mounted on the case.

According to a seventh aspect of the present invention, in the liquid crystal display device of the present invention, the case is provided with a columnar positioning boss, and the mounting member is provided with a positioning hole penetrating in a vertical direction. Was fitted in the positioning hole.

Further, as an eighth solution, the liquid crystal display device of the present invention has a configuration in which the positioning boss and the positioning hole are provided at least at diagonal positions of the mounting member and the case.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the liquid crystal display device of the present invention will be described. FIG. 1 is a perspective view of the liquid crystal display device of the present invention, FIG. 2 is an exploded perspective view of the liquid crystal display device of the present invention, FIG. 3 is an explanatory view of main parts in FIG. 2, and FIG. B is a sectional view taken along line 3B-3B in FIG. A, and FIG. C is a sectional view taken along line 3C-3C in FIG. 4 is a cross-sectional view of a main part in FIG. 3C, FIG. 4A is a cross-sectional view of a case, FIG. 4B is a cross-sectional view of a mounting member, and FIG. 4C is another cross-sectional view of the mounting member. .

A box-shaped case 1 made of synthetic resin and having an open top is provided with a bottom plate 1a, four side walls 1b provided on the outer periphery of the bottom plate 1a, and a bottom plate inside the case 1. A plurality of positioning bosses 1c provided on the upper surface of the side wall 1a or the side wall 1b, a plurality of claw portions 1d provided to protrude from the outer surface of the side wall 1b, and a plurality of claw portions provided on the side wall 1b below the claw portion 1d. A concave portion 1e, a gap 1f provided on the back side of the side wall 1b from which the claw portion 1d projects, and a side wall 1b.
A plurality of protrusions 1g protruding from the outer surface of
Guide groove 1h formed by a gap between two convex portions 1g, and stopper 1i provided to protrude from the outer surface of side wall 1b.
It is composed of

As shown in FIG. 3B, the lower side of the side wall 1b, which is connected to the bottom plate 1a, has a large thickness. Further, a plurality of positioning bosses 1c are provided integrally with the bottom plate 1a or the side wall 1b in the case 1, and have a columnar shape perpendicular to the bottom plate 1a. This positioning boss 1c
It is provided at least at a diagonal position of the bottom plate 1a. Also,
A plurality of claw portions 1d are provided outside the side wall 1b.
The projecting height from the outer surface of the side wall 1b is formed so as to gradually increase from the upper part to the lower part of the side b, and an inclined surface N whose projecting height changes is provided. The lower surface L of the claw portion 1d is provided so as to be substantially parallel to the bottom plate 1a.

Further, as shown in FIG. 3C, the concave portion 1e
It is provided in a thick portion below the side wall 1b. The gap 1f is provided except for a thick portion on the back side of the side wall 1b where the claw 1d is provided.

Further, a plurality of convex portions 1g are provided so as to protrude from the outer surface by making the lower portion of the outer surface of the side wall 1b thick. In addition, the guide groove 1h has two convex portions 1
g, which is perpendicular to the bottom plate 1a and is formed by a gap formed by two opposing surfaces. This guide groove 1h
At least two opposing side walls 1b are provided. 1 and 2, a plurality of the stoppers 1i are provided so as to protrude from the outer surface so as to be integrated with the convex portion 1g and have a lower portion on the outer surface of the side wall 1b. Is substantially parallel to the bottom plate 1a. Note that the projection 1g and the stopper 1i may not be integrated.

Further, a flat liquid crystal display element 2 in which a liquid crystal material is sealed, a lamp 3 having an elongated rod shape, and a control unit 4 in which electronic components and the like are mounted on a printed wiring board are housed in a case 1. Have been. Further, the control section 4 is electrically connected to the liquid crystal display element 2, and the light guide 5 is disposed between the liquid crystal display element 2 and the bottom plate 1a.

The mounting member 6 made of a metal plate is a top plate 6a.
An opening 6b formed in the upper plate 6a;
, Four side plates 6d formed by bending an outer peripheral portion of the upper surface plate 6a, and a plurality of L-shaped arms 6e integrally extending downward from the side surface plate 6d.
And a plurality of guide pieces 6f integrally extending below the side plate 6d.
It is composed of

The opening 6b is larger than the effective display area of the liquid crystal display element 2. In addition, positioning holes 6
As shown in FIG. 1 and FIG. 2, a plurality of c are provided so as to penetrate the upper plate 6a, and are provided at least at diagonal positions of the upper plate 6a.

The arm 6e comprises a base 6g connected to the side plate 6d, and a locking portion 6h connected to the base 6g and formed to be long in the horizontal direction. The guide piece 6f is
It is provided extending below at least two opposing side plates 6d, and is formed to be slightly narrower than the width of the guide groove 1h provided in the side wall 1b.

The mounting member 6 is covered so as to cover the upper part of the case 1, the lamp 3 and the control part 4 housed in the case 1 are covered and concealed by the upper surface plate 6a, and the light guide 5 and the upper part thereof are covered. The liquid crystal display element 2 is sandwiched between the upper surface plate 6a on the outer periphery of the opening 6b and the case 1, and is mounted so that the effective display area of the liquid crystal display element 2 is exposed from the opening 6b. The positioning boss 1c has a distal end fitted into the positioning hole 6c. Also,
The arm 6e is locked to the claw 1d by the locking portion 6h. The guide piece 6f is located between the two convex portions 1g that form the guide groove 1h.

When the mounting member 6 is mounted on the case 1, the tip of the positioning boss 1c protrudes from the positioning hole 6c so that it can be visually recognized from the outside. The upper surface of the locking portion 6h of the arm portion 6e and the lower surface L of the claw portion 1d are locked by contact. Also, the upper surface U of the stopper 1i
And a substantially small distance from the lower end of the side plate 6d.

To assemble the liquid crystal display of the present invention,
First, the light guide 5 and the lamp 3 are placed at predetermined positions in the case 1.
The liquid crystal display element 2 having the control unit 4 attached to the side is disposed above the light guide 5. Next, the guide piece 6
f is inserted into the guide groove 1h and guided, and the positioning boss 1c is positioned so as to be fitted into the positioning hole 6c, and the mounting member 6 is put over the case 1. Next, while guiding the guide piece 6f by the guide groove 1h,
The engaging portion 6h of the arm portion 6e is brought into contact with the inclined surface N of the claw portion 1d, and the mounting member 6 is pressed against the case 1 until the upper surface of the locking portion 6h exceeds the lower surface L of the claw portion 1d. On this occasion,
The side wall 1b provided with the claw portion 1d bends in the direction of the gap 1f provided on the back side thereof, so that the press-fitting of the arm portion 6e is performed smoothly. When the mounting member 6 is pressed, the upper surface U of the stopper 1i is
abuts against the lower end of d to regulate excessive pressing,
Prevents rattling after fitting and stabilizes fitting. Finally,
It is visually confirmed that the tip of the positioning boss 1c is fitted in the positioning hole 6c, and the case 1 of the mounting member 6 is
Installation to the is completed.

As shown in FIG. 3, when the mounting member 6 is mounted on the case 1, the distance C1 between the lower end of the side plate 6d and the upper surface U of the stopper 1i is very small.
The distance C2 between the lower end of the locking portion 6h of the arm 6e and the lower surface of the bottom plate 1a is larger than C1. With such a relationship, when the attachment member 6 is pressed to be attached to the case 1, the engagement with the claw portion 1d is favorably performed.

As shown in FIG. 4B, the corner E of the arm 6e which comes into contact with the inclined surface N of the claw 1d is smoothly chamfered by beveling or the like so as to eliminate burrs. . Alternatively, as shown in FIG. 4C, a portion including the corner E of the arm 6e is bent outward by bending or the like. In these cases, the chamfer angle Y or Z between the arm 6e and the side plate 6d is larger than the inclination angle X between the inclined surface N of the claw 1d and the side wall 1b. In this way, the arm 6e is smoothly locked to the claw 1d.

[0030]

According to the liquid crystal display device of the present invention, the mounting member 6 is mounted on the case 1 with the tip of the positioning boss 1c fitted in the positioning hole 6c. 6, the positioning boss 1c serves as a positioning target, and whether or not the mounting is surely performed can be confirmed by visually observing the projection of the positioning boss 1c from the outside. Assembly is easy and accurate.

Further, at least the mounting member 6 and the case 1
By providing the positioning boss 1c and the positioning hole 6c at the diagonal positions of, the liquid crystal display device can be assembled more accurately.

Further, the arm 6e is press-fitted into the claw 1d, the arm 6e and the claw 1d are locked, and the mounting member 6 and the case 1d are locked.
As a result, the liquid crystal display element 2 is sandwiched, thereby facilitating assembly of the liquid crystal display device, and also eliminating the need for a dedicated jig for assembly, thereby improving productivity.

The claw portion 1d is formed so as to be gradually higher from the upper portion to the lower portion of the side wall 1b.
The gap 1f is provided on the back side of the side wall 1b provided with the hook. When the liquid crystal display device is assembled, the hook 6h of the arm 6e is brought into contact with the inclined surface N of the hook 1d. Since the side wall 1b provided with the portion 1d is bent in the direction of the gap 1f, the press-fitting of the arm portion 6e is performed smoothly.

The mounting member 6 has a guide piece 6f extending downward from at least two opposed side plates 6d, and guides the guide piece 6f to at least two opposed side walls 1b of the case 1. It has a guide groove 1h, and when the mounting member 6 is mounted on the case 1, the guide piece 6f is guided by the guide groove 1h, so that correct fitting is facilitated when the mounting member 6 is mounted on the case 1. As a result, assembly becomes easier and productivity is further improved.

A stopper 1i is provided below the side plate 6d of the mounting member 6 and protrudes from the outer side surface of the side wall 1b of the case 1. When the mounting member 6 is mounted on the case 1, When the mounting member 6 is pressed against the case 1 in which the liquid crystal display element 2 and the lamp 3 are housed by mounting the lower end of the mounting member 6 against the stopper 1i, the mounting member 6 is erroneously pressed excessively. Also in this case, the upper surface U of the stopper 1i is
Since d is regulated, it is possible to prevent an unnecessarily large load from being applied to the liquid crystal display element 2 and the lamp 3 and to prevent the liquid crystal display element 2 and the lamp 3 from being damaged.

[Brief description of the drawings]

FIG. 1 is a perspective view of a liquid crystal display device of the present invention.

FIG. 2 is an exploded perspective view of the liquid crystal display device of the present invention.

FIG. 3 is an explanatory diagram of a main part in FIG. 2;

FIG. 4 is an exploded sectional view of a main part in FIG. 3C.

FIG. 5 is a perspective view of a conventional liquid crystal display device.

FIG. 6 is an exploded perspective view of a conventional liquid crystal display device.

DESCRIPTION OF SYMBOLS 1 Case 1a Bottom plate 1b Side wall 1c Positioning boss 1d Claw 1e Depression 1f Void 1g Convex 1h Guide groove 1i Stopper 2 Liquid crystal display element 3 Lamp 4 Control unit 5 Light guide 6 Mounting member 6a Top plate 6b Opening 6c Positioning hole 6d Side plate 6e Arm 6f Guiding piece 6g Base 6h Locking part N Inclined surface of claw 1d L Lower surface of claw 1d U Upper surface of stopper 1i E Corner of arm 6e X claw 1d Angle of bevel Y Angle of bevel of arm 6e Z Angle of bending of arm 6e

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Mitsuaki Yamazaki 1-7 Yukitani-Otsuka-cho, Ota-ku, Tokyo Alps Electric Co., Ltd.

Claims (8)

[Claims] 1. A liquid crystal display element, a box-shaped case accommodating the liquid crystal display element and having a columnar positioning boss on an upper surface, and a mounting member made of a metal plate and having a positioning hole vertically penetrated therethrough. A liquid crystal display device, wherein the mounting member is mounted to the case in a state in which a tip of the positioning boss is fitted in the positioning hole. 2. The liquid crystal display device according to claim 1, wherein the positioning boss and the positioning hole are provided at least at diagonal positions of the mounting member and the case. 3. A liquid crystal display element, a box-shaped case containing the liquid crystal display element and having a claw projecting from an outer surface of a side wall, a metal plate, and a lower part of a side plate provided on an outer peripheral portion. A mounting member having an arm portion extending to the claw portion, wherein the arm portion is pressed into the claw portion, the arm portion and the claw portion are locked, and the liquid crystal display element is formed by the mounting member and the case. A liquid crystal display device characterized by being sandwiched. 4. The claw portion is formed so as to be gradually higher from an upper portion to a lower portion of the side wall, and a gap is provided on the back side of the side wall provided with the claw portion. 4. The liquid crystal display device according to 3. 5. At least two opposing surfaces of said mounting member.
A guide piece extending downward from one side plate and having a guide groove for guiding the guide piece on at least two opposing side walls of the case, and when attaching the mounting member to the case, The liquid crystal display device according to claim 4, wherein the guide piece is guided by the guide groove. 6. The mounting member is located below a side plate,
A stopper provided so as to protrude from an outer surface of the side wall of the case, wherein a lower end of the mounting member abuts on the stopper when the mounting member is mounted on the case. 6. The liquid crystal display device according to 5. 7. A positioning boss having a columnar shape provided in the case, a positioning hole penetrating vertically is provided in the mounting member, and a tip end of the positioning boss is fitted in the positioning hole. Claim 3, Claim 4,
The liquid crystal display device according to claim 5. 8. The liquid crystal display device according to claim 7, wherein the positioning boss and the positioning hole are provided at least at diagonal positions of the mounting member and the case.